tolong dibantu ya isi cara terima kasih

bc = dc = 17
ab = ad
k = ab + bc + dc + ad
54 = 2ab + 17 + 17
2ab = 54 - 34
ab = 20/2 = 10
a) ob² = ab² - oa²
ob² = 10² - 6²
ob² = 100 - 36
ob² = 64
ob = 8
bd = 2ob = 2(8) = 16

b) oc² = cd² - ob²
oc² = 17² - 8²
oc² = 289 - 64
oc² = 225
oc = 25
ac = oc + oa = 25 + 6 = 31

c) L = ac × bd / 2
= 31 × 16 / 2
= 248